Probing a composite spin-boson environment

Abstract

We consider non-interacting multi-qubit systems as controllable probes of an environment of defects/impurities modelled as a composite spin-boson environment. The spin-boson environment consists of a small number of quantum-coherent two-level fluctuators (TLFs) damped by independent bosonic baths. A master equation of the Lindblad form is derived for the probe-plus-TLF system. We discuss how correlation measurements in the probe system encode information about the environment structure and could be exploited to efficiently discriminate between different experimental preparation techniques, with particular focus on the quantum correlations (entanglement) that build up in the probe as a result of the TLF-mediated interaction. We also investigate the harmful effects of the composite spin-boson environment on initially prepared entangled bipartite qubit states of the probe and on entangling gate operations. Our results offer insights in the area of quantum computation using superconducting devices, where defects/impurities are believed to be a major source of decoherence.

20 pages, 9 colour figures, I.O.P. style, published version; See Video Abstract at http://www.quantiki.org/video_abstracts/09014470

References in corpus (29)

• A computable measure of entanglement
• Distributed Entanglement
• Quantum state engineering with Josephson-junction devices
• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Decoherence in Josephson Qubits from Junction Resonances
• Decoherence and 1/f noise in Josephson qubits
• Entanglement from the vacuum
• Quantum noise in the Josephson charge qubit
• Scaling laws for the decay of multiqubit entanglement
• Entanglement properties of multipartite entangled states under the influence of decoherence
• Low-frequency noise as a source of dephasing of a qubit
• Non-Gaussian low-frequency noise as a source of qubit decoherence
• Low- and high-frequency noise from coherent two-level systems
• Superconducting Qubits: A Short Review
• Microscopic origin of low frequency flux noise in Josephson circuits
• Decoherence from ensembles of two-level fluctuators
• When are correlations quantum? -- Verification and quantification of entanglement by simple measurements
• Entanglement dynamics in chains of qubits with noise and disorder
• Entanglement Sharing and Decoherence in the Spin-Bath
• Models of environment and T_1 relaxation in Josephson Charge Qubits
• Low-Temperature Decoherence of Qubit Coupled to Background Charges
• One- and two-photon spectroscopy of a flux qubit coupled to a microscopic defect
• Rabi oscillations in a qubit coupled to a quantum two-level system
• Characterization of coherent impurity effects in solid state qubits
• Decoherence by a spin thermal bath: Role of the spin-spin interactions and initial state of the bath
• Decoherence by a spin thermal bath: Role of the spin-spin interactions
• Spatial Entanglement From Off-Diagonal Long Range Order in a BEC
• A scheme for entanglement extraction from a solid
• Quantum dynamics in nonequilibrium environments

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